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Diana264
a fost răspuns

Urgeent! E(x) = (1 supra x-1 - 1 supra x+1) : 1 supra x patrat -1 unde x€ R {-1,1}

Răspuns :

Mozaic
E(x)=[1/(x-1)-1/(x+1)]:1/(x²-1)={[(x+1)-(x-1)]/(x-1)(x+1)}:[1/(x-1)(x+1)]=
=[(x+1)-(x-1)]/(x-1)(x+1)*[(x-1)(x+1)]=(x+1)-(x-1)=x+1-x+1= 2

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